Mid Century style Christmas involves a vintage vibe that also has a Danish Modern simplicity to it. It's about woods like teak and birch, sleek metal and glass contemporary design, and some of the cheesy colorful accents that haunted the mid century time period.
Consider a colored Christmas tree like pink or blue. Hang Hawaiian ornanments with vibrant color. Go for a totally retro feel and scour the markets for 1950s ornaments, the standard stuff of most baby boomers' childhoods. The fake Christmas tree wave began in the 1950s and the trees were off the charts Jetson's vibe aluminum and tinsel, bright colors, and super fake looking.