I came up with these cute little patterns a few years ago and published them on craftster, and still get requests for them! (And I also credit them for my opportunity to meet and work with the fabulous CrochetMe Kim Werker. ;) )
These work up fast and you can do many variations on both to the "flavours", add bead or sequin sprinkles to the cupcakes, change the fillings in the sushi, the possibilities are endless!
The instructions may seem a little bit wide open, but really, they are open for interpretation and your own ideas for colours and "ingredients!"

Hook size H or one to work with your yarns
Yarn needle
Sewing needle & thread (to make cupcake cherry)

Cupcakes: Various small amounts of worsted weight yarn in the "flavours" you need- ie: brown for chocolate cupcakes, pink for strawberry frosting
- any additional embellishments- beads, sequins
- small piece of red felt for the "cherry"
- small amount of batting/stuffing
- short length of thin ribbon to hang (approx. 5"-6")

Sushi: Small amounts of Black and White worsted weight yarn for the seaweed & rice
-small amount of coloured yarns, orange, green, etc. for your sushi fillings
- small amount of batting/stuffing
- short length of thin ribbon to hang (approx. 5"-6")

Approx. 1.5" tall

n/a

Special stitches:
BPDC: YO, insert hook from back to front to back around post of next DC, YO and pull up a loop, (YO and pull through 2 loops on hook) twice - back post DC.

FPDC: YO, insert hook from front to back to front around post of next st, YO and pull up a LP, (YO and pull through 2 loops on hook) twice - front post DC.

Cupcake:
Use hook size H
Using Brown(Chocolate cake!) yarn,
Ch 4, join with a sl st to the first chain, chain 3 to count as first dc.