My favourite picnics are The Gorby (standard), Debbie's Killer 7s and Debbie's Killer Sandwich (both downloaded as .zwo from whatsonzwift).
The Gorby is tough but just about manageable, provided you're close to the level of aerobic fitness that corresponds to your input FTP.
Debbie's sessions really push your 1 minute efforts, especially as your legs start to feel heavy at the end of the session. Highly recommended.