Using Spinach Powder

I have some hand-me-down spinach powder I'm looking to find a use for. Web sources most often refer to using it in smoothies, and I'm not at all interested in using it in that way, but more a base for soups or in dips, frittatas, pasta, that sort of thing. My limited experimentation with re-hydrating the powder usually finds the base rather grainy. Anyone have experience in using it in this way? I would love some tips.

Thanks!

Late add: Excellent ideas from all of you; my thanks! Esp. the ideas concerning alternate ingredients for re-hydrating. Don't know why but that had completely passed me by. Back to the lab for some trials...