Flowers: A question for the panel

I struggle to organise the flower spaces in the garden. The spring is beautiful with bulbs but as the season progresses it loses a lot of its colour. I could, if I was inclined, research, buy and plant things from the garden centre but I'm tight and  time is always short when these things should be done,  as the veg patch takes all my concentration. 

As an experiment,  In an ideal world, if you had say a 2m² bed,  what flowering/colourful plants would you plant to give some colour for the main seasons, I'll let you off winter, if that makes it easier.  I think SC will be a dab hand at this one.

I'd fill it with repeat flowering perennials, not bedding plants. Not sure what as I'm not really a flower grower.

I'd fill it with repeat flowering perennials, not bedding plants. Not sure what as I'm not really a flower grower.

I was thinking perennials, the plant and forget type. Neither am I a flower person, that's my problem.  Is it a case you're either one or the other?