1) Reboot into recovery (clockwork mod)
2) Install zip from sdcard (choose zip from sdcard > *theme name*)
3) Reboot system now
Links in post 2.
Always try and have a reasonably fresh nandroid incase anything goes wrong (it shouldnt) or incase you dont like it.
If you want red and green call and end call buttons, look for it in the post below or follow the steps in this post.
If your ROM is not listed then you can upload you phone.apk and contacts.apk from system/app and I will theme them for you. Just mention your ROM and version number.
Please ask dialer related questions in this thread and not by PM. That is what this thread is for. Even if you have another handset, I will still make you a custom version. I get too many PM's to remember who wants what.
100% open source, free android goodness!
Click thanks if you like this.
More versions in post 2.