Eventually I bought a pot of Oxalis regnelli 'Atropurpurea' (Purple Oxalis), a struggling pot of Hydrangea macrophylla, 2 pots of Epsicia cupreata (Flame Violet) and a pot of patio rose.
Hopefully, I can get the Hydrangea to recover into a nice big plant. As for Episcia, I love the common green leaved red flowered variety. My mum used to grow them too. Similarly I hope I can get the Rosa to grow well into a big specimen pot plant for the Chinese New Year. I deliberately chose a colour that is not so common.