The Bokeh technique is a lot of fun.
I used Pacifica, Lagoon, and Saddle ink using a sponge to ink up the colonial white paper. Some people like to use a dauber instead of a sponge. When I use a dauber, it tends to look more like a dot of the ink instead of the blended inks.
When sponging, keep the sponge moving in a circular pattern. You don't want it to look like a sponge mark. It takes a bit of patience. I put the three colors on lightly then add more color where I want it darker or where I want it blended more.
Once your background colors are ready, add the white circles.
I simply punched a few sizes of circles from a piece of scrap paper to use as a template. Then I sponge colonial white pigment ink to form the circles.
The circles need to be a pigment ink so that they don't blend with the other inks. Pigment inks sit on top of the paper. The pigment ink takes a few minutes to dry before stamping your image on top.
I used the Seaside Greetings stamp set and mounted it on Saddle paper. I used CTMH's value pack card in Colonial White as the card base.
Here's another card using the same technique:
I used Gypsy, Sky, and Pixie inks for this card. The dots are in Daisy White pigment ink. The sentiment is stamped in black archival ink using the Happy To Be Friends stamp set.
Give this technique a try. You do end up with inky fingers but that is part of the fun.