My expectations about swaps -
I did do swaps for a while.
As has been mentioned in the rules/guidelines of the swap section, send what you would like to receive.
I think these expectations are reasonable:
1) That the colors listed should be the colors used.
I am aware of one swap where the colors listed were red, green, gold/yellow, and white. Someone came along and said - "Oh, I did not read the guidelines, and made my blocks in blue and yellow." (The blocks were pretty and nicely done, but did not go well with the other blocks.) Another instance was blue and yellow - I received a block made with blue background fabric with pink roses.
2) That the size should be very close to the expected size.
I know one can "improvise" - but how many newbies/beginners are even going to think about checking the dimensions? or what to do if the blocks are not the same size? I considered myself an "advanced beginner" - but it did not occur to me to check to see if all the blocks were close to the same size until I had them laid out and I was about 1-1/2 inches off in one row.