Spice tincture is something very handy. you can look at Q21 tek in the A/B section. He's explaining how to make an acetate tincture.
AS for Glycerin, I don't know how to do it but it would sound good.
SWIM would love to make one for pharmahuasca.
Smell like tea n,n spirit !
Toke the toke, and walk the walk !