@Singledwish123
The lab ray is all about chance and luck I fear.
For the species colour change, that's a Premium perk and yes, you can do it once a year. There are two possible ways to do it;
1. Get the colour pet you want in a different species. This is only really helpful if you can buy the pb or mp though so won't help for Robot. It works well for Mara pets for instance, as the PB is expensive but the Buzz MP is 900k or so. You then choose to change species and the paint job moves with it. So my Mara Buzz would become a Mara JubJub for instance.
2. Find a colour that your wanted species does not have. This is easier for some species than others but you're in luck with the Ogrin as there are a few non-existant colours and some of them are cheap. So ignoring lab only colours you have Biscuit, Candy, Glowing, Gold, Halloween, Invisible, Marble, Oil Paint, Pastel, Sketch, Silver, Speckled, Split, Steampunk, Strawberry, Toy and Woodland. You immediately want to discount the expensive ones. The cheapest is probably Glowing or Speckled I think? Followed by Split then Biscuit and Sketch. But after that you're into hundreds of thousands and then rapidly into millions.
Having picked one, you find a pet in that colour. So say we're doing Glowing, I see Aisha has a Glowing version. I pick up a morphing potion, change my pet to an Aisha and then paint it Glowing. I then go the Premium Perk Species Change and ask it to change my pet back to an Ogrin. Because there is no Glowing Ogrin, it gives me the opportunity to pick what colour I would like. I pick Robot. You then have a Robot Ogrin!
This gets more expensive if you want a pet with all or most of the colours. At that point you may have to go with the fruit Chia (not Strawberry as most pets have strawberry!) and it'll cost you a bit more as you will need to morph to a Chia (around 500k for the cheapest) and then buy a Magical Chia pop (again, around 500k for the cheapest).
Hopefully that helps!
(Note; you can buy one month of Premium, use the perk and then not renew. So you don't have to pay for a long running subscription to get the perk.)