As long as it's not commercial it's fine with me (you don't sell them)
Don't worry, I never sell any of my cartoons (I've learned long ago that it makes it feel like work and saps all the enjoyment out of creating for me. I hate getting paid to create). Rather, I instead always encourage those who want to give me money for them to instead use it to make a donation to their fave charity. ;)
I believe the other fellow above mentioned that you might have a spot on here somewhere for them or something? If so, I can always put whatever I create there.