You don't have to ask to use.
Please credit me.
Please don't link back. I'll get the mention.
Frankendolling is fine as long as the owner of the other bases are OK with it too.
You can use it to make free/point adopts, but no cash or paypal.
I put work into making these bases. You should too.
Edit: To anyone wondering what all those hidden comments are about, I was having a conversation with someone who was utterly refusing to credit.