Immediately, the choices aren't great. I can draw, which is a horrible idea. Or, I can use public domain images. After all, many folks do this and I'm making a game about history. But, I feel if I'm going to sell this game for any amount of money, I need to give people something somewhat special, even if it's not a Fantasy Flight caliber production.
I sketched it. If I could draw something somewhat decent, that was progress. I chose the Hardship card called "The Fort Clatsop Decision?" I thought a snowed in log cabin would be good. I played around with shading certain portions and keeping it simple. I was actually pretty happy.
I drew it on my sketch book. Plain white background. I picked a handful of colors (light blue, black, brown, white, yellow, and green) from my heap of construction paper, then cut out the shapes. I placed them in the proper layering order (like in photoshop) and glued them.
I then went back and added subtle accents. Tiny black slivers to separate the logs. Blue to accent the snow. Yellow to accent the tree.
I scanned it onto my computer. I cleaned up some of the rough spots. I then minimized it and put it onto the card.