For my Rainbows, I'm going to top up what we did last year and replace the odd thing with something new.
My main mental block is what to do with the Brownies. Already thought of making a card (which they'll probably do in school as well). Looking for something slightly different as the main activity.
For the other bits, looking at doing a Kim's game with Easter related pictures (need to get some clip art for that, which shouldn't be a problem) and also a quiz of some description. Both of which could be used in both Rainbows and Brownies as there'll be a bit of overlap.