Thank you!
Yes, you can give your site a different look every season.
Just remember, using the file name with a ’q’ for quarterly, it will run from, for instance, January 1st till March 31st. The winter season runs from about December 21st till March 21st.
If you want to do it right, just combine the ’w’ (weekly) for week 52 or 53 (depends on the year) and then ’q’ for quarter 1 to display the winter theme.