If you happen to have an old Microsoft Surface RT around, you know it's not good for much anymore. However, it makes a great wall panel for Action Tiles.
If you have one of these, I've created two 3D-printable files that you can use.
The first is a frame. Printed in white (or whatever is complimentary to your wall color), it gives the project a finished look.
The second is a way to handle the charging cord, without needing to drill holes in your walls.
Pictures of the completed installation are available at the links above. If you don't have a 3D printer, you can use the "order this printed" button to find someone in the community who will print it for you.
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