diff --git a/packages/base-types/src/models/project/index.ts b/packages/base-types/src/models/project/index.ts
index e76009326..eece49175 100644
--- a/packages/base-types/src/models/project/index.ts
+++ b/packages/base-types/src/models/project/index.ts
@@ -2,9 +2,11 @@ import { AnyRecord } from '@voiceflow/common';
 
 import { Member } from './member';
 import { Prototype } from './prototype';
+import { Themes } from './theme';
 
 export * from './member';
 export * from './prototype';
+export * from './theme';
 
 export enum LinkType {
   CURVED = 'CURVED',
@@ -20,7 +22,6 @@ export interface ReportTag {
   tagID: string;
   label: string;
 }
-
 export interface Model<PlatformData extends AnyRecord, MemberPlatformData extends AnyRecord> {
   _id: string;
   teamID: string;
@@ -37,6 +38,7 @@ export interface Model<PlatformData extends AnyRecord, MemberPlatformData extend
   linkType?: LinkType;
   prototype?: Prototype;
   reportTags?: Record<string, ReportTag>;
+  customThemes: Themes;
 
   members: Member<MemberPlatformData>[];
   platformData: PlatformData;
diff --git a/packages/base-types/src/models/project/theme.ts b/packages/base-types/src/models/project/theme.ts
new file mode 100644
index 000000000..3801a96e3
--- /dev/null
+++ b/packages/base-types/src/models/project/theme.ts
@@ -0,0 +1,11 @@
+type Shades = {
+  [key in '50' | '100' | '200' | '300' | '400' | '500' | '600' | '700' | '800' | '900']: string;
+};
+
+export interface Theme {
+  palette: Shades;
+  standardColor: string;
+  name?: string;
+}
+
+export type Themes = Array<Theme>;