That's actually nice of you, but I can't think of an instance in which I'd use these stickers with my friends.
I'd rather go for some stickers like
these or some cute, chubby ones with puppy-like eyes and all. But I'm not a designer so someone with an artistic hand could do it. I'm talking about something similar to this:

I think the text placed on your stickers are limiting the usage of them too much.
Don't take this as hate - I always like to come up with a bit of critique. It's a good initiative and I hope I won't offend you or anything but they seem a bit too simplistic and can only be used in specific scenarios... for example, online negotiations.. but I'd rather not send stickers during a serious transaction. Just saying.