Not shooting for "trippy" here, just something easy on the eyes and good for multi-tabling.
Right click the image below then click "save image as". Go to the following directory:
AmericasCardroom\images\game\themes\table\
theme2\tables
You can save this in any of the theme folders,
theme2, theme9, theme108 etc. within the above directory. You'll just be replacing one of the existing table themes.
Make sure when you save it that you name it
table and that it is a .JPG file.
When asked if you want to replace the existing file with the same name, click "yes".
Also you can avoid having the poker client overwrite your mods by clicking "close" as soon as you see the following window. Do it quickly. Obviously you'll want it to download updates from time to time so be sure to save a backup of any mods you want to keep.