Oh, I like coming up with project names. Explanations and possible acronyms in parentheses...

Onion themed:

• Peel (Perl Editor and Environment, Linked)
• Bloom (as in blooming onion, but it has a note of "becoming" in it as in a bloom on an actual flower)
• Rings
• Tears (The Editing And Refactoring System)
• Vidalia (the sweet onion!)
• Walla Walla (the other sweet onion)
• Soup
• Mushrooms (go great with onions)
• Peppers (these do too)
• Liver (Language In(ter?)dependent Visual Editing Resource?)
• Straws

Pearl themed:

• Diver or Perl Diver (Developer's Integrated Visual Editing Resource or Developer's Integrated Visual Environment and Resource)
• Price (the Perl of Great Price... Perl Resource for Integrated Coding and Editing)
• Accretion
• Necklace
• Strand
• Wisdom

Camel themed:

• Hump(s)
• Desert (it's a camel's natural environment)
• Stubborn (probably not a good virtue for an IDE, but used jokingly it might work)
• Caravan
• Tail (it's what a camel uses to swat at bugs)