My favorite craft would be the stainglass butterflies. We did this last year and I still love them and we placed them on our patio door. This year I want to do a nice little collection to add color and cheer. Icanteachmychild.com has a great tutorial, simply click on her picture and follow the link.
My girls keep talking about the April showers bringing May flowers so why not make some rain sticks? Happyhooligans.ca has a nice tutorial on making this fun craft