I have yellow, green, blue, black, and red.

I actually make bows and selling them under Etsy at MeridaMerchandise . All different kinds of bow and other Disney items.
Funny I have many other colors but in larger sizes than the 1/4". So if you have a chance check out the website because I have bows for the cruise too and travel pillows for the little ones.
What color of blue and green do you have?
We are in need of light blue (prostate) and dark blue (colon / bowl, and can give to those with thyroid - it is one of the colors in theirs)
We are also in need of dark green (liver)
You also said you have black. I was on the line of whether to do black for just melanoma, or burgundy for multiple melanoma (which my uncle died from, and I am fighting to over come). But, if you have black, it makes the same statement.
I was planning on getting a spool of the colors I am going to do, and just use the whole thing (or keep making one for each color until I run out of pins).
My idea was to hopefully heighten awareness by making sure everyone in the group had some kind of ribbon (I will probably make sure I am well stocked in care giver - plum and all cancers - lavender). Plus, I wanted to hand them out to cast members, new friends, etc.
So, I definately will be making plum and lavender if you get the other colors, and then will most likely also do a roll of gold for childhood cancer (beings that this was the reason behind this labor of love).
If anyone else wants to help, we still could use some extra colors....
....Burgandy (or burgandy w/ ivory), purple, pink, and white.
P.S. I will check out that site, I am still looking for an autograph pillow. If I find something I like, and pay you for it, could you bring it to the cruise to save us both on shipping??