This year I went with the dinner time theme. We had 'cupcakes' for dinner. They were meatloaf made in a cupcake tin (from Grandma's recipe), with mashed potato frosting, green pea sprinkles, and asparagus candles. The photos aren't great, but Max got a kick out of them and they were pretty yummy.
For dessert we had 'grilled cheese sandwiches' which were actually toasted pound cake with orange frosting for cheese. These were also a hit. Overall, Max spent quite a bit of dinner time cracking up.
The other thing I've come to love about April Fools' Day is the way many of my favorite tech companies get into the spirit. Did you find Pokemon on your maps yesterday? Or try to buy a Flux Capacitor Car Charger? There were a bunch on fun tech gags this year, here's a list of some of the best: http://techcrunch.com/2014/04/01/best-of-april-fools-2014-roundup-list
Did you partake in any silliness?