Just mix some of the powder into the Grunge Paste and then stencil with it.
This is Sunset Beach that I'm using:
Or you can try this : Alison Hall was demoing this technique at Ally Pally last week. She was using a different medium but I thought it would work well with GP and it does, so thanks Alison.
Sprinkle some Infusions onto card and place stencil over top:
Then scrape through the Grunge Paste picking up the powder as you go:
It gives a lovely variegated effect:
You can also try this: Grunge Paste your stencil as normal and let dry. Replace the stencil over the top and sprinkle on some Infusions:
You get a bit of a messy result but interesting texture. You could then colour the background with the Infusions or cut out the stencilled flower to disguise the messy bits:
If you blot it before removing the stencil it's a bit more controlled:
You could also use a wet brush to activate the powder and paint your Grunge Paste. Let the paste dry, replace the stencil and shake over some Infusions:
then paint over with a brush:
You can be a bit more careful than I was - you should be able to paint without any blobs round the edges ( I was standing up behind the tripod at the time!)
So there we go - Grunge Paste and Infusions.
Thanks for looking!