Random Adoption

[nitrogen]

I'm trying to build a "Pokemon" adoptables site.
Here's what I'm trying to do:
1) Quickly make all adoptables/Pokemon have the same egg image (SQL query/script modification?)
2) Edit the adopt.php page so that it serves a random adoptable (only one) (the user won't be able to tell which adoptable it is as they all have the same image)
This way the user won't know what they're adopting (no name, aids don't help, etc.) until they get past the egg phase.
Here's an example of what I'm trying to do:
http://www.virtuadopt.com/adopt.php

This is a Pokémon egg. I am not sure what it will hatch into. Just name it, and treat it well, someday, it may hatch into marvelous Pokémon species!

Is there a way to set the "level up" click amount to a span of numbers? Example: egg 1 will hatch after 5-10 clicks.

Is there also a quick way to add images? I have 500+ jpg images that I need to convert to gifs and upload. The Admin CP is way to slow at adding images (one at a time).[hr]
I figured out how to get number 2 to work. I searched the forum and found this:
http://www.rusnakweb.com/forum/showthread.php?tid=365
which helped a lot. I'm still trying to figure out how to get all the adoptables to share the same egg image without manually editing every single one and how to upload 500+ adoptables at once.
New "todo":
Get adopt.php to display eggs horizontally.