What about Niagara Grape eggs? Cover grapes in coloured foil to look like chocolates.
Easter Eggs in colours - hollow out egg shells and fill with jello
Chocolate bunnys? Fill them with mustard.
Pinterest has visual delights for Easter - jello easter eggs, glow eggs, shaving cream easter eggs, for us adults, bunny money, and then the toilet joke - jelly beans. Here are two for April Fool's Day.
In the purist world of April Fool's here's boredpanda.com for some ideas. These pranks come with a final score - check out the first one - insects on lamps. They were a 154 score - right on top and lowest work effort.