Enakku oru ummai therinjaaganum...

There are some tamil song lyrics which are quite difficult to understand at times. I am not talking about dubakoor second grade songs, but some top-class songs written in 'good tamil'. If you can throw some light on these, I will rest in peace.. :)

1) 'KanAkANum kAlangaL' (7G RC):

NadaipAthai kadaiyil un peyar padithAl

NenjukkuL EnO mayakkangaL piRakkum

What is the relationship b/w platform shop and her lover's name?

2) 'VeNNilavE' (VV):

VaNNangaL vaNNangaLatra vazhiyil vazhiyil silar nadakkiRAr nadakkiRAr

ManjaLum pachaiyum koNdu peyyuthu peyyuthu mazhai nanaikirAr nanaikiRar

In the first line, does he mean a life that is not colorful? And, in the second, what is the yellow-and-green rain? Rain falling at the backdrop of colored lights? And, what is the link b/w the two lines? Engeyo udhaikkira madhiri irukkey..

3) 'KaNNukkuL nooRu nilavA' (Vedam puthithu):

Aanin thavippu adangividum

pennin thavippu thodarndhuvidum

When I heard this song for the first time ages ago, it appeared as if Vairamuthu talks about something sensual, so I left it like that... Recently, I was discussing about this song with a friend and for sometime, when I think about the lyrics, it means nothing obviuos. Considering the next line (Ullam enbadhu uLLavaraikkum inbam thunbam ellamey iruvarukkum), the above dont sound like anything sexual. What is she trying to convey by such a statement? What 'thavippu' (or quest) does she talk about which is different for men and women?