Well I have been a long time in the forum without posting much things
that are useful for most of you so I decided to make a little guide to
help some of you to mod your ROMS, I just want you guys to remember that
I am not responsible if this guide breaks your phone, makes it stuck on
a bootloop of something like that, you are doing this knowing the
consequences of this.
Well I am showing you some basic stuff, that make differences, so your phone can stand up in the crowd 
First of all im starting by modding your build.prop which is located on
/system/ so to start off lets open or CMD which you can find by hitting
Start>Run>*Tipping* CMD /or/ WindowsLOGO+R then tiping CMD.
Now that we have our CMD opened we will *CD* to our SDK/ADB folder.
If you have latest SDK like me, I have my SDK/ADB in Program Files/AndroidSDK/AndroidSDK/platform-tools
So in my case I type in:
cd\
cd Program Files/AndroidSDK/AndroidSDK/platform-tools
Now lets connect our phone via USB. Once the computer detects it we go to CMD and type in:
adb devices
You are supposed to see a *Serial Number* if so keep on reading, if not
retry connecting/desconecting your phone, if you still have no serial
number post what you did here.
Now to modify our build.prop
1. We need to download Notepad++ which you can download Here
2. Download and Install, you know how to do that 
3. Go to your CMD and type in
adb pull /system/build.prop
4. This will make a file called build.prop appear in your platform-tools
folder, look for that file, right click it and click: Edit with
Notepad++, once you hit that wait for a while until Notepad++ opens.
5. You are supposed to see ALOT of numbers and words, those are values,
we are looking for: (ro.product.model=*******) * is supposed to say
something like MB501 or CLIQXT, if you can't find it hit CTRL+F and type
in ro.product.model= and you should find it, that value there is the
"Model Number/Name" you can edit it like I did, change it to any name
like "Nexus S /or/ CLIQXT, ON CRACK
" become creative.
6. Once you finish hit CTRL+S and close
7. Go to your CMD and type in:
adb push build.prop /system/
8. This will push the modified build.prop
9. Now to see the effects type in CMD this:
adb reboot
10. This will reboot your phone, once it boots go to Settings>
About Phone>Model Number and you should see your edited Model Number 
I will continue to post other mods, im on a hurry these are some BASIC
stuff, I will show how to edit a framework-res.apk and other stuff like
that.
PLEASE IF THIS HELP YOU, THANK ME IN THE BUTTON BELOW IT DOESN'T TAKE 2 SECONDS TO DO THIS, WHILE THOSE 2 SECONDS HELP ME 
EDIT:
Here is a example of a editted build.prop by me (This is @turl CM7
)
CLICK ME FOR EDITED build.prop
EDIT2:
10 Thanks below and I will teach the easy way of applying Custom
ANIMATIONS to your phone, THE EASY WAY, just hit the THANK button below. <-- Just go to this post, register/login and hit thanks :)
EDIT3:
CUSTOM ANIMATIONS :)
You can change the device name, also the rom name. Just be very careful what you edit, because you can REALLY screw things up if you edit the wrong lines. ;)
Yes, if you have the kitchen, you can pull the build.prop, and use notepad++ to edit it. It gets tricky, because you have to edit it, click file>save, then, click file>open, select the build.prop you saved, and just drag and drop it in the file you got it from. DO NOT delete the old one first, or the changes won't take (which is weird).
Thank you @1madfitter
@1madfitter I think my way is a tiny bit better ;) thanks all, any other help, I'm here. And like @1madfitter also said changing the wrong lines could lead to x| lol.
Oh I agree that you way is easier, this is just the method I'm using as I am cooking a whole ROM, not editing just the build.prop. If that's all you are doing, then your way is by FAR easier, lol.
Yey! :) haha, guys any other question, im here to help, got 4 thanks on Modmymobile, so register/login if you want a guide on how to put custom animations, ON ANY ROM :)
For those that have Root Explorer its A LOT easier!
Go to /system and mount as R/W
long press build.prop and Open in Text Editor
Now edit the lines
When you're done save. It will create a .bak file and its up to you if you delete it or move it somewhere else as a backup just in case.
Reboot and check your modifications.
I posted something like this on M3 Cliq/Themes but it was mainly how to change Start-Up Tone.. same process... just thought i'd share.
@DoubleOEK That is a nice way but, Root Explorer is NOT free, what if I have a computer ? Doing it via the phone sucks :)
EDIT: Ive got 5 thanks on Modmy, 5 more for custom anims :)
i dont see the thax buton... btw
Its on MODMYMOBILE, you already gave a thanks there :)
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