I use the spinning coin cursor as my busy cursor, so I thought that it would be nice to have a matching working in background cursor. While I was at it, I created a full set (small, medium, large × normal, reverse, inverse). The bottom three are the inverse cursors, but it’s hard to show that with a GIF.
4-bit colour animated cursors; click a cursor to download it.
The cute blue hourglass cursor from Acorn RISC OS. The frame rate is only an approximation due to using an emulator.