Here's my custom Raspberry Pi 3 digital card display. It cycles through images of my favorite trading cards like Pokemon, Magic the Gathering, Yugioh, baseball, hockey, football, etc. It's an alternative if you don't want to use one of those digital photo frames. With this 5 inch LCD, the displayed cards are almost the same size as the real life cards.

Check out my youtube video for a more thorough tutorial:

Step 1: Parts

Raspberry Pi 3 B+ kit
https://amzn.to/2Mw5Ira

Waveshare 5 Inch HDMI LCD
https://amzn.to/2Mw5Ira

Waveshare 5 in LCD manual
https://www.waveshare.com/wiki/5inch_HDMI_LCD

Step 2: Raspbian OS

This custom build of Raspbian has the drivers for the display already setup. Use etcher to burn it to a 8GB or more microSD card.

Raspbian Image with Waveshare setup
https://drive.google.com/open?id=1cyLR1lPJsAtIPe--...

Waveshare 5 in LCD manual
https://www.waveshare.com/wiki/5inch_HDMI_LCD

Step 3: Download Images

High quality card images can be found on Google images or from pkmncards.com.

Step 4: Feh Image Viewer

Install feh image viewer

sudo apt-get install feh

sudo apt-get install unclutter

sudo apt-get install xscreensaver

feh command DISPLAY=:0.0 XAUTHORITY=/home/pi/.Xauthority /usr/bin/feh --quiet --preload --randomize --full-screen --scale-down --auto-zoom --reload 360 -Y --slideshow-delay 60.0 ~/cards/pokemon/

Autoboot card display
sudo nano /home/pi/.config/lxsession/LXDE-pi/autostart

add:
@/home/pi/pokemon-display.sh

Step 5: Bezel

I created a 3D printed bezel. I printed the label with a color laser. This is completely unnecessary but I wanted to make the display look like a PSA graded card.

3D printed PSA bezel
https://www.thingiverse.com/thing:3391374