As for 954, it reminds me that for a long time the number 459 for me was somehow synaesthetically associated with the autumn colors yellow, orange, and brown -- but I couldn't tell you which number was associated with which color.
(2 is blue, 3 is red, 8 is black, and maybe 0 is white -- but these are not strong associations, and I don't have any for the other digits -- poor 1, 6, and 7: such sad and colorless numbers)