Well I assume the best way is to custom my own Paypal code, but I'm not there...
I've been looking for the past two days now a donate which contains the following features:
1. customized button
2. Anonymous payment
3. amounts can be controlled from code. A drop down menu will be nice
4. thank you page & Email
5. can be add to the iFeature theme at the "Boxes" section, without goes wiled