My baby loves:
Washcloths. He is just fascinated by them. He carries them around in his mouth, he waves them in his hands, he puts them in and out of their basket and he puts them over his face/head. Occasionally I'll give him a little pile of about 2-3 wet washcloths (wrung out so they don't drip) and he has so much fun with them.
Old remote controls/cell phones. He loves the feel of the buttons and likes to push them.
Wooden spoons.
A bowl or a play kitchen sink full of suds. I squirt dishsoap in my sink and use the sprayer nozzle to foam up the suds really tall, then scoop them off and let him play with them. Very fun, very non-messy since there really isn't much water in them.
2-3 feet of ribbon, with edges melted so they don't fray. He loves trailing ribbon behind him as he walks.
Wooden thread spools (the craft kind you find in a craft store). He likes putting them in a basket and taking them out, and stacking them, rolling them, etc.
A deck of playing cards with a little bin. For some reason he finds these fascinating too, though they mostly just end up in a pile and he throws them.
A hat or two.
A receiving blanket to cover up with and roll around on and drag through the house...we have Aden & Anais swaddlers and they are perfect and lightweight enough for him to do lots of fun things with.
A baby toothbrush, wet with water and used while supervised.
A few plastic travel bottles glued shut, filled with random pretty beads, colored water, oil or other interesting things, to look at and shake.
Also...every now and then when I just need to do something and need him out of my hair for a bit, I give him a box of Kleenex. He is in his glory then.
One thing that all my kids have loved from the time they were crawlers is playing with the buckles in their infant seat. I would purposely bring it into the house and turn back the handle for stability, just so they could crawl up to it and mess with the buckles. They loved doing this.
ETA: Just saw the age of your kiddo. Mine is 13 months, so if you like any of these ideas, just save 'em for a later date!
