The recent incarnation of Fedora (new logo and accompanying graphics) have seemed to turn the distribution further away from what Red Hat used to be and the path they take toward RHEL in relation to the artwork. I personally did not prefer the theme shipped with FC5 and the "bubbly" look. The graphics seem to be going away from what the artwork team in RHEL and before Fedora took or even Novell/SUSE take. I actually liked Bluecurve except for the grey and "blah" buttons and such that came with it but the use of blue and icons were very nice. Fedora just doesn't seem to be taking the same path anymore and seemes to be going toward a more "kiddish"and "bubbly" theme. I hope that the team could somehow look toward a different default theme going more toward a "professional" look.
Art is subjective so I wouldn't call this a bug just a matter of taste (I loved the bubbles as it made Fedora look more fun and aprochable). There is an active Fedora Art comunity which decides on the direction to take the artwork (the new icons in my view are a huge improvement over Bluecurve which had a cartoony look). In any case the proper formum for this is the Fedora Art community not bugzilla.