Spinner blast X Normal you end up with a 12.5% chance of each egg making one of the following. (Spinner Blast is Spider, Pin, and Pastel if memory serves me right.)

Normal, Spider, Pin, Pastel, Bumble bee, spinner, Pastel Pin, and Spinner Blast.

If a spinner blast was bred to a spider the odds get kinda funky.

6.25% chance of a Normal
18.75% chance of a Spider
6.25% chance of a pin
6.25% chance of a Pastel
18.75% chance of a Spinner
18.75% chance of a bumble Bee
6.25% chance of a Pastel Pin
18.75% chance of a Spinner Blast

Now if we go Spinner Blast to Spinner Blast Chrismas Occurs

Normal 1.5%
Spider 4.8%
Pin 4.8%
Pastel 3.1%
Super Pastel 1.5%
Spinner 14.1%
Bumble Bee 9.3%
Pastel Pin 9.3%
Spinner Blast 28.1%
Killer Bee 4.8%
Super Pastel Pin 4.8%
Super Spinner Blast 14.1%

(Above numbers rounded to first decimal place.)