How can I make scribblenauts more fun.

Just go nuts with it, I have tons of fun in this game just making ridiculous things and downloading other peoples silly creations.

Get items from workshop or create new ones

It's really a game you play in short bursts rather than beat it all at once I think I play through like 5 of the missions a day and it remains fun that way.

Write down each letter of the alphabet on a piece of paper, put in hat. In new area, choose random letter. You may only use words beginning with that letter.

Pray you do not draw the X.
(This is actually what I do with my friends, we hook the tv up as 'the monitor' and I man the keyboard while they drive themselves crazy trying to think up words. I remember it being easier in original scribblenauts, before they brought in this 'make people happy' nonsense.)

use cheats ;D

I have it on WIIU and the thing that I can suggest to you to make it more fun is to invite people to play/sit with you. I let my little cousins play for it and we take turns. It's godly fun especially when you're hearing suggestions left and right what to scribble

Try to solve all of the puzzles using babies. Preferably dead ones.