I’m interested in vector/polygon (+vertex color) stuff due to high fidelity for low data cost, but even for that 1KiB is a huge restriction.

I made a polygon loader and text format, and even there the .txt file is 1.2KiB for a 32x32 grid (though my 16x16 ones are mostly 390 bytes, a 31x15 oval is 630 bytes).