You would actually have to have access to the animation strips built into the theme file. If you can contact the creator of the theme you like you could ask for the files so you can switch them around.

Should you get the files it is as simple as just hitting browse, selecting the file, and making sure the amount of frames it is looking for is correct.

Thank you! 

Please know that is a commentary on the holidays and not some massive demand to go crazy and buy a ton of software.... unless you wanna.

The part you can't see in that clipped poster is... well I will just show you.