Add sun dried tomatoes, avocado, sea salt, and red pepper flakes (optional for heat) to a food processor. Process until well combined into a paste.
Using a mandolin, carefully slice the cucumbers into 1/16" slices.
Add the paste into a piping bag or zip block bag. If using a zip lock bag, seal it at the top and cut a small amount off of one of the corners to make your own piping bag.
Using the bag, pipe a line of the paste down the middle of a slice of cucumber.
Carefully roll up the cucumber and stick a toothpick through to hold it all together.
Top with crushed almonds if desired to add an extra level of flavor.