Loo Rolls Modules and Pot!

Now I have the cold frame erected I'm thinking of sowing

Beef Tomatoes - in Plastic Water Machine Cups
Plum Tomatoes - in Plastic Water Machine  Cups
Gardeners Delight - in  Plastic Water Machine Cups
100s and 1000s - in  Plastic Water Machine Cups
Spring Onions in Modules as suggested by DD
Runner Beans - in Toilet rolls

I don't want to get into tray sowing and then all they bother picking out and moving into pots - I have a variety of tray liner modules some bought others given and plastic water cups with holes burn in the bottom - what size module or plastic pot size, or other item would any reader suggest, I use for the

Cabbage
Cauliflower
Brussels Sprouts
Broccoli
and Peas

Thanks for the advice - problem is Mrs Cadalot stuffs all the window ledges full of knick knacks and there is little space for anything else. Do you think I will get away with the cold frame in a couple of weeks time? I'm just itching to grow something - B&Q had all kinds of plants today Tomatoes, beans etc.  when I went to buy some sand.