There are all the usual "icons", which are superimposed on the photo
of the product and indicate something or other. For example, a picture of a red asterisk with the word "new" means a new picture with the sign "%" — that this, the product has a discount "sale" — the sale of this product.
And how can the same method be noted that the product currently is not available? What methods do you use? UPD.
Decided to use the following option: the item picture do translucent, put the attribute:
... title="Not available. Supply 01.03.2011" />
and the surrounding descriptive text (name, characteristics) do semitone lighter.
Thanks for all the options!