Like Lisa - there are some seeds I can probably nab more of if I'm aware someone wants them (or I may have from a swap and could list), so I'm happy to see this thread as well.
I'm always happy to receive:
Alyssum,
Baby Blue Eyes Nemophila menziesii
Forget me nots (blues - annual or perennial),
Flax (red or perennial blue (linum) or Bright Eyes)
Violas (any, also called Johnny Jump Up),
California Poppies (any color of the Eschscholzia californica)
Nigella (regular blue) and
Linaria (Toadflax).
I toss them onto pots with spring bulbs and everywhere I can find a spot. Can never have too many of those.
The picky part of my wish list is:
Allium unifolium (12"high decorative)
Aquilegia Columbine flabellata 'Ministar' (dwarf or other dwarf columbines)
Aubrietia (Rock Cress, prefer solid colors, looks like most commercial seed is a mix)
Convolvulus tricolor 'White Ensign'
Kalimeris incisa
Nepeta Felix (12 inches tall! May not come true from seed, I understand)
Phacelia campanularia, desert bluebells, California-bluebell
Salvia elegans Pineapple sage
Salvia gesneriiflora 'Tequila'
Salvia roemeriana 'Hot Trumpets'
Salvia Ulignosa Bog Sage (It can handle dry conditions)
Santolina chamaecyparissus dwarf grey (nana is one compact variety)
Schizanthus (any)
Verbascum Southern Charm
Verbena Tuscany White