Going to a ballgame
I have also taken my toddler to little league games (we didn't even know anyone playing, we just showed up at the park and sat in the grass and watched!). This is a great, free option if there are no professional teams near or you have a toddler who is not interested in sitting long enough to make the cost of a professional game worth it (though the one we attended was really inexpensive).
First, I prepared a large baking sheet by covering it very well with aluminum foil. I placed a piece of finger-painting paper on top and added a small squirt of washable paint of several colors on the sides.
Admittedly - I was really expecting this activity to be a dud. I thought that T would have a hard time with the concept of rolling the ball around in the paint and would just want to throw it or lick it. I was simultaneously very right, and very wrong. He didn't really get the concept of rolling it, and definitely just wanted to pick it up. But I kept my "process over product" motto in mind and watched him develop his own strategy for painting with the ball.
Most of his process involved picking up the paint covered ball and bouncing it on the paper, which made a really cool design. The ball naturally rolled around the tray because I was holding it on my lap and not a flat surface. The paper was filled with impressions from the bouncing ball, streaks from his fingers as he picked it up, lines from the ball rolling across the page, and more. It was easily one of my favorite projects with him and I loved the colorful product it created!
Tape Resist Football Painting
For this project, I cut out a section of a white paper plate into the shape of a football. I wanted something heavier than computer paper, as I learned from our primary color squishy bags that this technique doesn't work well with thin paper. I then used painters tape to tape of the white lines at the end of the football and lines for the laces. (Unfortunately, I learned from this project that painters tape doesn't come off of paper plate super well...I'd try finger-painting paper next time).