In reply to mc2006:
Vignemale can be done in a day from Gavarnie ( bivvy Lac d'Ossoue ) around 1600m ascent. Half a dozen 3000m summits can be bagged !
Aneto can be done from the south using the Ballibierna track, again around 1600m ascent. Bus service in season, the track is closed to cars. The same access can be used to tackle the two 3000m Ballierna peaks.
Using the Cavelers lake for access, a few of the Aigues Tortes 3000m peaks can easily be done in a day : Beciberri, Como Lo Forno & Punta Alta. The traverse from Beciberri North to Pico Celestin Passet is a fine outing, graded AD.
Posets can be done in a long day from the Viados hut ( car access to the hut itself). As can the Eriste peaks, a few of which pass the magic 3000m mark !
If you're fit the traverse from the Eriste Col to Posets is a spectacular ridge route, graded PD+. Photo in my gallery !
Plenty there to wet your appetite !