@kjl66 Welcome to NGA Kristy
The blues and purples of the salvias/sages would go very well with the yellow of the stellas and the lavender/purple of the geraniums. Salvias range from white, pale pink all the way to deep dark purple so, white, pale pink or purple all would work. Salvia madrensis, Forsythia sage, has nice yellow blooms and it would also work well.
