PTs accomplish two things. For damaged, porous hair, they fill in the "holes" in the hair strands. For fine hair, they add additional structure and support. Many people report a boost in wave/curl formation. If you do a PT prior to coloring, it will also help to give more even color results.
I don't know of any PTs involving eggs (I use IAGirl's PT, which is gelatin based). You might want to try searching the natural hair care forum and the NC.com site as a whole.
3a/f/iii Before the chop- Donated to Locks of Love, January 2013
Modified CG since 11/5/11
CO-WASH: VO5 Vanilla Mint Tea Clarifying, DevaCare No-Poo
CLARIFY: CHS Treatment Shampoo (used prior to PT/DT)
RO: DevaCare One Condition, Regis Olive Oil
LI: Cure Care, As I Am Leave-In
STYLE: Re:Coil, Curl Keeper, Biotera Gel, Deva Ultra Defining Gel, GVP Liquid Sculpting Gel, Curls Rock Amplifier and Strong Hold Mousse
PT/DT: IAGirl's PT, One n' Only Argan Hydrating Mask