I cut outset letters with my 90° bit. Then I cut the "cloud" using the same bit, same depth. That leaves a lot of wood to be removed between the letters and the cloud's edge. So using the same 90° bit, but set to cut slightly deeper than the original cuts for the letters, I cut random swirls to remove portions of the excess wood.
Then I painted the background. After the paint dried I sanded the surface again to remove any overflowed paint. This will leave high spots on the cut-out back ground. So I used a Sharpie Felt Tip Pen to color these high spots.
Then I applied 3 coats of Krylon Glossy Clear Acrylic sealer......sanding lightly between coats with 000000-steel wool. Be sure to clean the sign and make sure the wool fibers are cleaned off between coatings.
I may not know what I'm doing, but I am having fun doing it wrong!!
Happy Day Veterans!!