Filling Out The Missing Squares In My Picture Grid

Using ADO/ASP, I want to retrieve a list of pics from my db (which will be
dynamic number of pics as a user will be uploading anything from 1 to 12
pics) and put them in a grid (table) of say 3 x 4 cells.

I think this is easy to do if the user has uploaded 12 pics, as the
recordset's recursive loop will create the table for me, but my problem is
that what if they only upload 4, 5 or 7. How do I list these pics in my
grid, but get the ASP to neatly finish off the 3 x 4 grid? If I just leave
it to my recordset of say 7 recs then my 3 x 4 table is going to disjointed
and unfinished.