The transforms in MVNRomFXTemplates are intended to be copied and changed to customize the effects without having to dive into the shader code itself.
Here's a few quick ones I did, but you can tool with the numbers yourself and produce whatever variations you'd like:
transform MVNVignettePink: mesh True shader "MakeVisualNovels.LPVingette" u_vin_radius (0.5) u_vin_softness (0.3) u_vin_strength (0.5) u_vin_center (0.5, 0.5) u_vin_tint (1.0, 0.4, 0.6)
transform MVNVignetteWarm: mesh True shader "MakeVisualNovels.LPVingette" u_vin_radius (0.5) u_vin_softness (0.3) u_vin_strength (0.5) u_vin_center (0.5, 0.5) u_vin_tint (1.0, 0.3, 0.0) transform MVNVignetteCool: mesh True shader "MakeVisualNovels.LPVingette" u_vin_radius (0.5) u_vin_softness (0.3) u_vin_strength (0.5) u_vin_center (0.5, 0.5) u_vin_tint (0.2, 0.4, 1.0) transform MVNVignetteDream: mesh True shader "MakeVisualNovels.LPVingette" u_vin_radius (0.5) u_vin_softness (0.3) u_vin_strength (0.5) u_vin_center (0.5, 0.5) u_vin_tint (0.2, 0.9, 0.4)