I imagine someone must have suggested this already somewhere - or Jack has - but thought i'd raise it anyway.
Particularly useful for percussion grooves in live situations.
Things could get more sophisticated of course. For example commercial drum loops often come sorted out by bar length ( ( 1/2/4 bars etc ) and into types - vamp/fill/intro-fill/end-fill/fill-to-vamp
But the above could also be a dangerous slide into something like an arranger - which is not really what loopers are about....