It's very easy to customize with your own images and animations, no coding is required. Simply copy your image or animation to the SD card of your Android device or internal memory if your Android device doesn't have an external SD card.
For static images, use the Pixel Slideshow app
and copy your image to the pixel\pixelslideshow directory of your Android's external SD card or internal memory. Images with black backgrounds or PNGs with a transparent background will give the best results. Just keep in mind the LED matrix is a low resoluiton of 32x32 meaning large, high-res images will not look good. If your image is not 32x32, not to worry, the app will automatically scale it to 32x32 before sending it to the LED Matrix.
Note also the last image displayed on the LED Frame will remain even after the Android device is off. This means you can simply use your Android phone to set the image and then it will remain for as long as the LED Matrix has power.
To use your own animations, use the Pixel Animate app
and copy your animations to the pixel\pixelanimate directory of your Android's external SD card or internal memory. The animations must be in animated .GIF format. Yes that's right, those really annoying animated GIFs we used to see plastered on pages in the early days of the Web. Well as it turns out, many of those animated GIFs are also annoying on the LED Matrix. So you probably want to author your own using your favorite video editor and then just export to the animated .GIF file format. I used Adobe Flash Pro for the aquarium and 80s arcade animations you see in the project video but many other tools like Adobe Photoshop, Adobe Premiere, etc also support the animated .GIF format. I recommended a frame rate of around 10 frames per second (FPS). I tried some at 24 FPS which worked but the video was a little choppy at times. Keep in mind it's low res 32x32, so 10 FPS is more than enough. If you're just downloading an existing animated .GIF off the Internet or your animations are not in 32x32 resolution, the app will detect this and automatically re-size to 32x32 for you before sending to the LED Matrix.
Here's the full version of two custom animations I did for this project using Adobe Flash Professional.