I've also used Seasons of Joy for inspiration. So we do use a 'theme' for each circle time, something seasonally related, like flowers in spring, or the colours of the rainbow, or rain, etc.
You are actually supposed to do pretty much the same thing for a whole week or two at a time before "switching it up". This is how kids ge to learn, know, and love the stories and songs you're doing. So when you do it the first day, you don't worry about "teaching it" to the kid, you just show it to them, maybe do it a couple times, maybe they start trying to do it with you and maybe they don't (depending on what it is)... then over the next few days, they start participating and interacting more.
I remember some of the songs we were doing in the early spring for our circle time. One was "Winter goodbye, winter goodbye, you may no longer stay, springtime is on its way, winter goodbye, winter goodbye", it has a real pretty melody. Well, winter was LONG in leaving this year. Several weeks after we'd moved on to a different springtime circle theme, she was looking out the patio doors at the SNOWSTORM, and started impromptu singing "winter goodbye", and talking about how winter wasn't listening so she needed to sing it LOUDER and proceeded to almost YELL-sing it again... it was soooo cute and so funny. That wouldn't have happened if we 'changed it up' every day; she'd had the chance to really internalize the song.
I remember when I was learning about Waldorf ideas in homeschooling, I thought that 'circle time' was one of the sillier notions. But I did give it a try, and golly she LOVES it. Even if we're not doing a lot of 'pure' Waldorf otherwise, we're going to keep with the circle time!
A typical circle time for us starts with lighting a candle and reciting the candle poem, then we'll do a bunch of shorter poems, songs, and fingerplays, anywhere from 5 to a dozen (as the days go on sometimes I'll cut out a few if they're obviously not resonating with her as well, or I'll tell her we're going to pick between 2 of them to keep for the next circle times). There will often be a more active one in there towards the end, one that involves running around or something like that. Then we'll have the longer story, where she just sits and listens to me read it -- or, as the days go on, we might act out the story with playsilks while I read it, or have her draw from it, or other stuff like that as she gets to know it. Again, the repetition of the same story for at least a week is part of the whole point. :)
My daughter is 4.5yo, so a bit older than yours, so sometimes I also give her a bit more say in what we're doing. Like, I'll ask her if she wants to keep doing the same circle time again or if she wants to move on to a new one -- and if she does want a new one, does she want it to be about seeds, or about animals? Or whatever. The 'rainbow' one we did was actually her idea, I pulled songs and poems from various sources, used playsilks with the fingerplays, it was a biiiiiiiiiiiig hit!!!