This isn't quite a border or a frame, but it could be used as some sort of divider. Not sure how you could use a trippy strange Uncle Sam, but you'll find a way. You always do!
This is a completely free image Trippy Uncle Sam Points that you can download, post, and use for any purpose.
Image License: CC0 No Rights Reserved
You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission, and at no cost. This image is completely free.