Well if you really like the tyrannian lupe you could paint the lupe =) You might be waiting a long time for a tyrannian ixi... if there is another colour you like better though why not sell the pb and put those neopoints towards your pb of choice? Or if there is another tyrannian pet you really like you could transmog/morph one of your pets into that species and then paint it.
I have a tyrannian lupe so I'm a little biased towards them, but I'm also going to buy another tyrannian pb soon to make a tyrannian peophin. If I hadn't planned on a tyrannian pb though and won one then I'd sell it and save for something I already had my eye on
And congrats on the win ^^