Wonderful abstract, Wendy! I'm your get pushed partner this week and have really enjoyed going through your albums! You're a hard one to challenge as you have such variety and interesting images throughout. A challenge I just had that was a lot of fun was ICM (intentional camera movement). I did it using a zoom but have seen very interesting shots on the site that use a prime lens with hand movement or tripod panning. Does that sound interesting enough for you (and more important, is it something new and not a repeat?). If it's 'old hat' let me know and I'll suggest a plan B.
