Change windows theme based on season

A couple of Sundays ago I was laying in the couch with a small hangover and my kids were watching cartoons I got an idea that I would like to have my theme and desktop wallpaper change with the weather season. Since I am Swedish I wanted the wallpapers to be from my home country. I found out that Microsoft had season themes with desktop pictures from Sweden on their homepage, so I could easily use Bits to download the themes. I made 5 variables with the days of each weather season stored in them and then used a switch to install the correct theme based on season. It worked like a charm and I scheduled a task on my main computer on each login so it will change theme as when season change. I also sync themes on my other computers that use Windows 8.1 and 10 so i get the correct season theme on all my computers.