We've stayed at disney over easter a few times and the resort shops offer to make easter baskets w/ items you pick out (and pay for, of course). Does Universal do this too?
That's pretty neat that Disney does that, I didn't know about it!
I've never heard of Universal doing something like this but you never know. Might want to call the hotel(s) and just ask, that would probably be your best bet.
But even if they didn't offer something like this you could pretty easily do it yourself. Just take a rental car (if you have one) to Wal Mart and pick up the necessary items and put the baskets together in your car while your spouse is at the parks with the kids. After they've gone to sleep the night before just run out to the car and grab the baskets.
Of course it would be better if Universal staff would do something like this, but if not at least you have some other options.