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Soap and Candle Molds.com have a wide variety of molds to choose from. The nice thing about these silicone molds is that they usually pop out fairly easily.
One of the stranger ones that is new to me anyway is the little pizza mold.
The more common and comforting molds for candles are cinnamon buns. What would you scent a pizza candle with? It is still cute and I suppose it would have come in handy when I was on my doll house kick. 
I’ve been toying with the idea of making a yarn cozy or yarn ball holder on the circular knitting machine, but I haven’t gotten to it yet. In the meantime, here are some yarn cozy knitting patterns you can make with knitting needles. Use yarn to hold you yarn!
In its simplest form, a yarn cozy is just a sleeve or a little basket that holds your yarn when you’re working with a center-pull ball so it doesn’t fall apart when you knit. The easiest ones I could find are from Love in Stitches KN, which has a regular size and a mini size. They’re worked with sock yarn and there are options for making them with ribbing, faux cables and with self-striping yarn.
For bigger cakes there’s a project called We call it the “bail holder” from Nicole LeBlanc. This pattern is available on Ravelry and you can use any yarn and make it any size you like. It features an I-cord edging that has a loop in it so you can thread they yarn through the loop to keep it extra contained as you knit.
Another large one that has a slightly fancier pattern is this one by Mareike Meye. You can use any yarn and any gauge, and slip stitch pattern worked in different colors on the sides makes it a little more fun and uses a bit more stash. A strap buttons across the top to hold the ball in place and you can add a buttonhole to the middle of the strap to thread the yarn through. Check this one out on Ravelry.
Adding lace to a yarn cozy makes it fit a wider variety of balls and expand or shrink a bit as needed. Jennifer Sugarman’s Ball Sack uses sock yarn and is made to hold sock yarn. It has the option of making I-cord or using ribbon or cord you already have to make a drawstring at the top. You can find this pattern on Ravelry.
Another lacy option is the yarn ball holder from Frugal Knitting Haus. This one uses worsted weight yarn and has an easy mesh lace pattern and an I-cord drawstring that’s sewn together at the ends so you could loop it over your wrist while you knit if you like. This pattern is also on Ravelry.
Speaking of wrist yarn holders, I also found this one form Knituition. This one uses sport weight yarn and has a spiral rib pattern on the body. The strap is attached to the bag with D-rings, or you could make it a little longer and just sew it into the bag.