Those 4 figures from the SDCC A Fan's hope DVD w/ Stan, Joss, and I forget who the other 2 guys were fit well. That's where the Stan Lee head (MC11) in my store is from. I didn't get the pack w/ Joss, and whoever that other guy was, because it's the exact same DVD, but I keep thinking about it every time I walk by it at TrU.
I found some mini-figure Turtles at Goodwill the other day and it took a while to locate the origin of them.
They are the Mini-Ripped up figures from the 2005 line. The heads, hands, and feet look viable for 90s cartoon 1:18 Turtles. They all use the same sculpt so there wouldn't be much diversity to the team's look. Scale pictures will be added in a little bit.
I also saw a pretty good custom using the Flying Heroes Turtles from the Bridge Direct.
The 2 heads are on the 2 Leo's in the front. They are on the classic figures bodies. For scale, Slash is a MU Rhino.
The Hero portal Casey Jones might work as well. I don't have one of those yet though for scale.
And I think I can get a helmet on ol' Donald here if I take off that cap of his. I really think this would work with an angry Donald head. I'm sure there's an overpriced PVC figurine out there somewhere that would work.
Dollar Tree PVCs. Apparently there are several figures in the Simpsons line but all I saw were Marge, Woo Hoo Homer, Bartman, Lis and I believe Maggie. The adults being the only Joe compatible ones. I'd like to find Mr. Burns. He'd be good on a suited buck.
I have seen the Lego heads used on Joe figures, may have been on HT.
I got the Krusty PVC figure. I like that one a lot and plan on putting it on an Ice Cream guy buck.
besides that there are some new Ghostbuster mini figures that have an animated look to them but fit fairly well. They have figures from both the new movie and the classics. In blind bags and as 3-packs.