Hi,
I made a wallhanging for my brother's 25th wedding anniversary. I made simple blocks that were just a plain square of white bridal type fabric that I framed with folded fabric that was loose enough to slip pictures from their wedding, special events in their life and their children. I used colored fabrics for the framing edges that were used in their wedding. I used my embroider machine to put dates like their wedding day, birth of their children etc. as captions in the sashing. The pictures are actually removeable or changeable. The other alternative is to reproduce photos on fabric and just make blocks that include them. I was able to trim it with white lace as my sister-in-laws dress was very full and fairy princess like.
Many people make an anniversary quilt with signature blocks that they have various relatives and guests sign before sewing them into the quilt.
THe fun part is that it will never be used on a bed so you don't have to be very practical about fabrics and construction.
Have fun.