Excellent, as always. The rainbow one is hilarious! Oddly, the whole rainbow-slide thing (combined with the scary-ass contextual ponies), reminded me of that scene in the first Fantasia movie to Beethoven 7.

Anyway, #1 would, indeed, be like the best birthday gift ever and #4 is the sketch for the sexiest picture EVER. I agree with duck_or_rabbit. #3 is actually a fairly plausible AU. Didn't people think Remus was a Ravenclaw for a bit, anyway?

And the other two are just adorable.

Nice job.