Thank you everyone for your lovely comments. Thank you too to oksewglad for highlighting my albums under my Profile, where I am slowly putting all the photos of my selvedge quilts and other quilts I make.
To answer some of the questions asked :
How do you get so many selvedges? - well I must admit I cut them off fabric as soon as I buy it but I have some great friends (both local and overseas) who give me their selvedges , I trade for them and I also buy them from a local online quilting store.
I sew my selvedges, which I like to be at least 1/2-1 inch wider than the actual selvedge, onto a tracing vilene which stabilises them so they don't go out of shape. The extra 1/2 inch allows you to 'anchor' the next selvedge securely so they don't pull apart.