Sorry Dave, I can't do that.
Try:
flximg.com/500x400/project
To avoid random, add a number (integer):
flximg.com/500x400/project/3
or a filename:
flximg.com/500x400/project/grape-field.jpg
Auto height (keep aspect):
flximg.com/500xauto/project/3
Auto width (keep aspect):
flximg.com/autox500/project/3
Get original size:
flximg.com/auto/project/3