To make the pumpkin stems, I
stained some wood shims that I found
at our
local hardware store a dark
stain, then used my jigsaw to cut the ends off to give a more rustic, ripped from the vine look.
One option you can try but it may not work the best, I'd have to see the project to give a better call... would be to scrape the grout as much as you can... then apply a grout / concrete
stain which can be found
at a
local hardware or paint
store... then apply a concrete sealer on top of the dried
stain.