I have a set of outdoor lights that stay outdoors, that are programmable, so they are always seasonal/holiday/birthday related. Indoors we do Halloween, Christmas, Easter, and I'm sure others
That's my plan for our new home. I just have to figure out what to buy.
Otherwise, we have a couple of light-up penguins that my kids like having out for Christmas. I could be just fine without any decorations, but it is what it is.