I like Demented. It is nice to see a die cut card be an eraser, but also the round shape of it makes it look totally like a small can of sauce.
I also like Boreo and Geek Giant.
All in all, I think Topps did a great job with the erasers! I love that they did the detail of pull tops and can edges on the sodas. But to me, the dimensions/shapes just seem way off.
The baggie edges on candies were great, but it seems that they didn't get the art 'wrappers' overlayed right (at least on mine), and dimensions can't be right with so many different 'bagged' products.
Demented is my favorite - it's cool to see a die-cut title, and the can proportions really do remind me of a large can of tomatoes. And the Wacky itself is totally recognizable and legible at this size! Geek Giant is the same shape, and works well for me, too, and the gag is recognizable, but a little too small. Cavemanwich is just too detailed to appreciate at this size.
Prickles works great in the tall format, and is my second favorite. Ditz and Frosted Snakes next. In all of these cases, the package shape works, and while I can't read all the details, the title and basic art carry the gag for me, even at the small size.