I love his unique style, first and foremost. The colors, shapes, and patterns are really unlike any artwork I've seen, at least on the sports side. I think they'd look great in a larger format, such as 16x20.
Here's a great Mantle - a Hellmar Art Stamp. It has a very cool, authentic vintage feel to it, include perforations.
Perhaps the most unique item was this row of stamps. It's awesome looking! I didn't break them apart or anything, but it just feels like something you'd find in a time capsule that was buried in the '50s.
Jeff, thanks for your generosity and sharing your talent! I encourage everyone to follow Jeff on Twitter, and take a look at more of his work HERE.