Thanks folks, got what I was looking for and more than I expected.

My local craft store has had several kinds of pens including Prismacolor, but never in the various shades of green that I wanted. Stopped by again yesterday and came away with about 6 shades in Prismacolor and 1 generic green in Sharpie. A little costly to buy them that way, but less than buying a set of 250, and was able to use them that night instead of awaiting shipment.

Was hoping to make a couple foam frogs and use them on a pond this weekend, but neither plan is working out (I messed up the frog twice, my flexible glue is dried up, and way too many honey-dos).

By the way, don't try to finish up a weed guard loop if there's more thread wrapping to do.