Ask HN: visualizing recurring and one-off revenue?

How do you graph your SaaS metrics/revenue from subscriptions and other payments?

Ideally, I'd like to visualize both length of relationship (i.e. individual and average length of subscription) and revenue from customers.

I've seen lots of examples with simple bar charts, but I'm looking for any creative solutions to this that you've seen or that you've come up with yourself.

edit: currently I only use simple line charts for revenue and a grouped bar chart for length of relationship. Any better ideas? Thanks!