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		 I believe "yellow" refers to cowardice in this song: 
 
"So then I took my time 
Oh what a thing to've done 
And it was all yellow" 
 
- The fact that he took his time means that he was being a coward towards a potential relationship (the waiting / taking time was "all yellow"). 
 
"I swam across; I jumped across for you 
Oh what a thing to do 
'Cuz you were all yellow" 
 
- When he finally decided to act, he found out that the other person was also reluctant / cowardly towards the relationship. 
 
"I drew a line; I drew a line for you 
Oh what a thing to do 
And it was all yellow 
Yeah, yeah..." 
 
- Since both people didn't know whether or not to make the leap into a relationship (especially the other person - not the singer), he decided to force it into a friendship by "drawing a line", i.e. making that decision for both of them.  This final surrender and lack of courage is also considered cowardly, or "yellow" - "yellow line". 
 
IMHO, this is not a happy song, but rather sad nostalgia about a missed opportunity.  The fact that the singer says "For you I'd bleed myself dry" means, obviously, that he would still do anything for the other person. 
		
		
		
		
		
			
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				A plan is just a list of things that don't happen.
			 
		
		
		
		
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