In a medium saucepan, combine cream, milk, sugar, Blueberry Festival tea leaves, and vanilla. Cook over medium heat just until mixture begins to boil. Remove from heat. Steep for 5 minutes. Strain through a fine-mesh sieve into a bowl. In a medium bowl, whisk egg yolks until smooth. Slowly pour the hot cream mixture in a steady stream into the yolks, whisking constantly.
Transfer mixture back to the saucepan. Cook over medium heat, stirring constantly with a silicone spatula until thick enough to coat the back of a spoon or until temperature reaches 180°F on an instant-read thermometer.
Strain mixture through a fine-mesh sieve into a stainless steel bowl set over an ice-water bath. Cool completely, stirring often to prevent a skin from forming. Cover and refrigerate for 2 hours.
To serve, divide chilled crème anglaise and fruit among individual bowls.