Haven't seen one yet either, but I looked through the textures and the models on the opening screen, and thought, "Hey, there are two
Star brand stores. Maybe I should change one of those..."
I figured, as there are parodies of North America and European stores, how about a parody of an Asian store? So I changed the flashing storefront sign and the (default) Sidewinder security ship textures into parodies of the Japanese store chain FamilyMart, making GalaxyMart:
(Of course it still says it's a Star security. When I try to change that, the station disappears. Not sure what I'm missing there.)
For those who are (if you still are; I just discovered Oolite about three days ago!) interested in the textures (the ABC lettering changed to "X" for ambiguity's sake), you can get them here:
http://www.keeper1st.com/pics/oogmart.zip
I'll have to work on making a texture for the replacement Sidewinders, too... I just noticed and downloaded those tonight.
Anyway, as for potential new ads... What came to my mind was one that advertises the publication of
Who is this God Person Anyway? -- the latest book by Poolitzer-winning author, Oolon Colluphid (I mean, c'mon, his name even starts with "Oo"!). Another possibility (perhaps replacing one of the animated signs on a Constore) is a recreation of the animated billboard for Zik-Zak ("Know Future") in
Max Headroom.